Search found 2287 matches

by Prime
Wed Jun 21, 2017 3:12 pm
Forum: acorn atom
Topic: Creating a Atomic Chess Board...
Replies: 26
Views: 347

Re: Creating a Atomic Chess Board...

As the datasheet says "all CMOS designs", since the 7445 (or LS45) isn't maybe Acorn found they needed the pullups.

Cheers.

Phill.
by Prime
Wed Jun 21, 2017 8:48 am
Forum: acorn atom
Topic: Creating a Atomic Chess Board...
Replies: 26
Views: 347

Re: Creating a Atomic Chess Board...

Being open collector, don't you also need pullups? Just checked the Atom keyboard circuit and that does indeed have pullups, unless the 6522 has them internally, I know one of the ports on the 6821 do so might be the case here too :) It's also worth noting that 74xx145 are also compatible. Cheers, P...
by Prime
Sat Jun 10, 2017 10:15 pm
Forum: acorn atom
Topic: Is there still any interest for Atom2k15 boards
Replies: 4
Views: 122

Re: Is there still any interest for Atom2k15 boards

They use the PLCC Xilinx XC95xxXL chips don't they? With a small amount of re-engineering they could be converted to use the same chips in TQFP which are still available. Though I did wonder about making an adapter board as thingls like the Atom RAMROM have the same problem.

Cheers.

Phill.
by Prime
Fri Jun 09, 2017 7:10 pm
Forum: for sale / freebies
Topic: For free: RISC OS 3.50 ROMs
Replies: 3
Views: 162

Re: For free: slightly damaged 486DX4 PC card, RISC OS 3.50 ROMs

I'll have the 486 card if no one else wants it, I think that's the 100MHz version which is faster than the one I have.

Cheers.

Phill.
by Prime
Wed Jun 07, 2017 3:06 pm
Forum: hardware
Topic: PSU question.
Replies: 11
Views: 286

Re: PSU question.

It should run without a load, but I think the auxiliary supply voltages will be out of spec. So use a load. I use a 6V 4W lamp. Mark Might fire it up first, check the 5V, and if that's ok put a load on the 5V and check the others (+12 and -12 in this case). Also any idea how long the HT caps take t...
by Prime
Wed Jun 07, 2017 12:13 pm
Forum: hardware
Topic: PSU question.
Replies: 11
Views: 286

Re: PSU question.

Right Having sourced replacement 100µf 250V Caps, and a replacement bridge rectifier I'm ready to try swapping them. So can the beeb PSU be run un-loaded or as is common for most switch mode PSUs do I need to put a load on the +5V line to get the PSU to "switch on". Also I notice the repla...
by Prime
Fri Jun 02, 2017 10:04 am
Forum: hardware
Topic: part list bbc psu ?
Replies: 17
Views: 611

Re: part list bbc psu ?

1024MAK wrote:Yes, the secondary side windings of T2 and T3 are not correct. But the primary windings should be okay.

Mark out of intrest did you ever finish doing the schematic of the secondary side? Would be intrested if so in the PCB files please.

Cheers.

Phill.
by Prime
Thu Jun 01, 2017 6:11 pm
Forum: hardware
Topic: PSU question.
Replies: 11
Views: 286

PSU question.

Hi all, I have an ASTEC model AA12570 PSU that has a fault that I'd like to get fixed if I can. This uint is basically the same as a Beeb PSU except that instead of -5V it outputs -12V. This is from the Dragon Alpha prototype machine. Anyway apart from the normal change the X2 (and possibly startup)...
by Prime
Sun May 28, 2017 9:59 am
Forum: acorn atom
Topic: Prime's ROM/RAM board
Replies: 11
Views: 552

Re: Prime's ROM/RAM board

Hi Prime, I've recently acquired a lovely Atom - great condition and working fine. I've had it modified slightly to run off of steady 5volts. It's completely unexpanded so I'm thinking one of your boards along with the AtoMMC would be the go? Are you able to provide one for me and post to Australia...
by Prime
Fri May 26, 2017 11:18 pm
Forum: hardware
Topic: Length of 1MHz bus cable.
Replies: 3
Views: 160

Length of 1MHz bus cable.

Hi all, I'm about to mount my internal datacentre in one of my masters, but also want it to have the ability to have an external interface such as BeebSID or BeebOPL plugged in at the same time. So what I had thought about doing was to either : 1) Loop the lead either to a socket out the back of the...
by Prime
Fri May 26, 2017 7:56 pm
Forum: off-topic
Topic: CJ Micros
Replies: 5
Views: 255

Re: CJ Micros

danielj wrote:Concur. You will get substantially more bang for your buck if you go to retroclinic...

d.

And won't get your PSU going bang after a few minutes because Mark will have serviced it properly.

Cheers

Phill.
by Prime
Fri May 26, 2017 9:01 am
Forum: software: other
Topic: VT100/ANSI terminal emulation via OSWRCH
Replies: 54
Views: 1553

Re: VT100/ANSI terminal emulation via OSWRCH

That's execllent work, would have been useful a couple of years back when I was trying to get some of the slogger files off an Acorn CP/M disk, It's really useful to be able to write code to handle them on the source platform, and I'm probably more familliar with Turbo Pascal (In that I still use it...
by Prime
Thu May 25, 2017 11:37 pm
Forum: off-topic
Topic: bizzare substitution in private message!
Replies: 18
Views: 393

Re: bizzare substitution in private message!

Perhaps expand to cover all football teams. So as not to be teamist. That could be a long list without further selection...all teams in the world, europe, UK, above a certain division. Since a lot of them contain the name of the town or city they are based in it could make discussing meetup locatio...
by Prime
Thu May 25, 2017 11:05 pm
Forum: hardware
Topic: MaxRAM - New Open Hardware BBC RAM/ROM Board
Replies: 94
Views: 2968

Re: MaxRAM - New Open Hardware BBC RAM/ROM Board

Not used WinCUPL with those perticular chips but I have used it to compile the PALs on the Master Ram board and Plus3 ramrom boards for the Electron, and it is a bug ridden PoS :( I really wish Atmel would release the source code for it if they are not interested in fixing it so someone else could :...
by Prime
Thu May 25, 2017 10:31 am
Forum: off-topic
Topic: bizzare substitution in private message!
Replies: 18
Views: 393

Re: bizzare substitution in private message!

danielj wrote:I suggest you take it up with Arcadian ;) :D

That strikes me as being just a little childish.

Cheers.

Phill.
by Prime
Thu May 25, 2017 9:09 am
Forum: for sale / freebies
Topic: New TEAC floppy drives
Replies: 32
Views: 801

Re: New TEAC floppy drives

Likewise I'd take a couple, if for no other reason than I can get them now I may not be able to in the future :)

Cheers.

Phill.
by Prime
Wed May 24, 2017 2:23 pm
Forum: hardware
Topic: Electron Plus 3 RAM/ROM board problem
Replies: 25
Views: 628

Re: Electron Plus 3 RAM/ROM board problem

Another thought. The instructions refer to removing IC9 instead of the wiring pins 3,13 & 7. If I removed IC9 might this make damage to the tracks to IC9 irrelevant? At worst it would make accessing the tracks possible since I guess the damage is from the cutters and underneath the chip. If you...
by Prime
Wed May 24, 2017 12:34 pm
Forum: hardware
Topic: SRLOAD and DataCentre
Replies: 8
Views: 202

Re: SRLOAD and DataCentre

The simplest work-around is: *LOAD :5.ROMFILE 3000 *SAVE :0.ROMFILE 3000+4000 *SRLOAD :0.ROMFILE blah blah I guess you may be able to do : *LOAD :5.ROMFILE 3000 *SRWRITE 3000 7000 8000 x That seems to work testing in MESS from a DFS image, providing I'm in mode 7 just to make sure I'm not actually ...
by Prime
Wed May 24, 2017 9:21 am
Forum: hardware
Topic: SRLOAD and DataCentre
Replies: 8
Views: 202

Re: SRLOAD and DataCentre

danielj wrote:No, it's not :( you have to copy it to a ram drive or idehd first...

Humm I wonder why that is, shouldn't SRLOAD just read them from the currently selected filesystem ?

Cheers.

Phill.
by Prime
Wed May 24, 2017 12:56 am
Forum: hardware
Topic: SRLOAD and DataCentre
Replies: 8
Views: 202

SRLOAD and DataCentre

Hi All, Is it possible to SRLOAD a ROM file direct from the USB drive on a Master? Every time I try it complains that it cannot find the file : I have my rom files in a directory so : *DRIVE 5 *]CD ROM *. then lists the roms in the folder, just 2 at the mo DFS226 and RAMUTILB.ROM Attempting to load ...
by Prime
Tue May 23, 2017 8:32 am
Forum: for sale / freebies
Topic: New TEAC floppy drives
Replies: 32
Views: 801

Re: New TEAC floppy drives

Yeah maybe interested too

Cheers.

Phill.
by Prime
Mon May 22, 2017 3:11 pm
Forum: hardware
Topic: Electron Plus 3 RAM/ROM board problem
Replies: 25
Views: 628

Re: Electron Plus 3 RAM/ROM board problem

I forgot that I bought 2 boards. #-o The other has exactly the same problem so it is very unlikely to be the board. Ray Ray, If you put the original Acorn ADFS (or DFS) rom back in does the interface still work? This should work even with the mods to IC9, as they just allow the ROM socket to be ena...
by Prime
Mon May 22, 2017 3:06 pm
Forum: software: other
Topic: VT100/ANSI terminal emulation via OSWRCH
Replies: 54
Views: 1553

Re: VT100/ANSI terminal emulation via OSWRCH

Humm looks like you got Wordstar working, wonder if this will allow Turbo Pascal to also work on Acorn CP/M That would be good.

Cheers.

Phill.
by Prime
Sat May 20, 2017 9:29 pm
Forum: hardware
Topic: Electron Plus 3 RAM/ROM board problem
Replies: 25
Views: 628

Re: Electron Plus 3 RAM/ROM board problem

Hi Ray, Couple of things I notice.... 1) you have stripped the wires back a fair way before soldering them, this shouldn't be a problem as long as they don't touch and short anything else. Typically you only need a couple of mm of exposed wire, and yeah I know that often the insulation will 'peel ba...
by Prime
Fri May 19, 2017 10:29 am
Forum: hardware
Topic: Electron Plus 3 RAM/ROM board problem
Replies: 25
Views: 628

Re: Electron Plus 3 RAM/ROM board problem

May also be worth checking the ROM socket in your plus 3, I've just had to replace mine with a turned pin socket as I was having problems with my Plus 3 :)

Could you post some pictures of the inside of your plus 3 to see if we can spot anything.

Cheers.

Phill.
by Prime
Tue May 16, 2017 11:01 am
Forum: hardware
Topic: Master RAM board new version.
Replies: 99
Views: 6496

Re: Master RAM board new version.

Here's the ROM files and the build batch file I use to make the MRB rom, I think it's pretty simple to understand.... MRB_ROMS.zip Basic is the basic rom. OS is the normal Electron MOS MasterRAM is the Slogger patched MOS file. The batch file as supplied puts the same 64K image in both halves of the...
by Prime
Mon May 15, 2017 3:06 pm
Forum: projects
Topic: Starting a Prince of Persia port...
Replies: 21
Views: 962

Re: Starting a Prince of Persia port...

oss003 wrote:Wow ...... this is a real challenge ..... :)

Does that mean we'll see an Atom version at some point....... :) :) :)

Cheers.

Phill.
by Prime
Mon May 15, 2017 10:24 am
Forum: hardware
Topic: Domesday86 Project
Replies: 57
Views: 1899

Re: Domesday86 Project

Hi all, I had a look at Jason's BeebSCSI module at the meetup at the weekend and one thing we discussed is why the AVR used was an AT90USB1287? As this chip is nearly £10 a pop. Especially considdering that the interface doesn't use the USB part of the AVR. So I downloaded the schmatics / code etc f...
by Prime
Mon May 15, 2017 9:13 am
Forum: upcoming and recent events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 188
Views: 6675

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

Thanks to all that made this a successful event enjoyed this one and actually got a load of stuff done. Glad the turtles worked out shame about the length of bettery life, someone (not me) needs to design a fast charging circuit for the batteries, so that we don't need to charge them for 18 hours :(...
by Prime
Sun May 14, 2017 1:33 pm
Forum: emulators
Topic: BBC Emulator as .DEB package
Replies: 15
Views: 515

Re: BBC Emulator as .DEB package

You may be able to configure and compile on one machine and just tar up and copy to the others, if you compile it to install all of it's files under somewhere like /usr/local/b-em (for example) you should be able to do the tar and copy method. Depending on how close the versions of Ubuntu are in ter...

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